Add the solutions for part 1 of days 15 and 16.

T-Dimov · Dec 17, 2024 · 6b6d15a · 6b6d15a
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diff --git a/Advent of Code 2024/16/16.cpp b/Advent of Code 2024/16/16.cpp
@@ -0,0 +1,12 @@
+#include "maze.h"
+
+#include <iostream>
+
+int main()
+{
+	const auto		fileName	{ "input.txt" };
+
+	Maze			maze		{ fileName };
+
+	std::cout << maze.findLowestCostRoute();
+}
diff --git a/Advent of Code 2024/16/16.vcxproj b/Advent of Code 2024/16/16.vcxproj
@@ -0,0 +1,147 @@
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diff --git a/Advent of Code 2024/16/16.vcxproj.filters b/Advent of Code 2024/16/16.vcxproj.filters
@@ -0,0 +1,44 @@
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diff --git a/Advent of Code 2024/16/maze.cpp b/Advent of Code 2024/16/maze.cpp
@@ -0,0 +1,153 @@
+#include "maze.h"
+
+#include <fstream>
+#include <algorithm>
+#include <array>
+#include <queue>
+#include <unordered_map>
+
+Maze::Maze(std::string_view fileName)
+{
+	std::ifstream	input	{ fileName.data() };
+	std::string		line;
+
+	if ( std::getline( input, line ).good() )
+	{
+		fSize.fX	= line.length();
+		fMap.push_back( line );
+	}
+
+	int	i { 1 };
+	while ( std::getline( input, line ).good() && !line.empty() )
+	{
+		if ( auto j = line.find( 'S' ); j != std::string::npos )
+			fStart	= { static_cast<int>( j ), i };
+
+		if ( auto j = line.find( 'E' ); j != std::string::npos )
+			fEnd	= { static_cast<int>( j ), i };
+
+		fMap.push_back( line );
+		++i;
+	}
+
+	fSize.fY	= fMap.size();
+}
+
+size_t Maze::findLowestCostRoute() const
+{
+	std::priority_queue<State, std::vector<State>, std::greater<State>>	queue;
+	std::unordered_map<Point2D, std::unordered_map<std::byte, int>>		dist;
+
+	queue.emplace( fStart, Direction::R, 0, Maze::heuristic( fStart, fEnd, Direction::R ) );
+	dist[ fStart ][ Direction::R ]	= 0;
+
+	while ( !queue.empty() )
+	{
+		State	current	{ queue.top() };
+		queue.pop();
+
+		if ( current.fPos == fEnd )
+			return current.fCost;
+
+		const States	neighbours	{ this->getPossibleNeighbours( current ) };
+
+		for ( const auto& [newPos, newDir, addCost, heuristic] : neighbours )
+		{
+			const int	newCost			{ current.fCost + addCost };
+			const int	newHeuristic	{ Maze::heuristic( newPos, fEnd, newDir ) };
+
+			if ( !dist[ newPos ].contains( newDir ) || newCost < dist[ newPos ][ newDir ] )
+			{
+				dist[ newPos ][ newDir ]	= newCost;
+				queue.emplace( newPos, newDir, newCost, newHeuristic );
+			}
+		}
+	}
+
+	return -1; // No path found
+
+}
+
+Maze::States Maze::getPossibleNeighbours(const State& current) const
+{
+	static const Point2D	dirX		{ 1, 0 };
+	static const Point2D	dirY		{ 0, 1 };
+
+	static const auto		canMoveTo	= [] ( char cell ) { return cell == '.' || cell == 'E'; };
+
+	const Point2D&			curr		{ current.fPos };
+
+	const Point2D&			cellU		{ curr - dirY };
+	const Point2D&			cellD		{ curr + dirY };
+	const Point2D&			cellL		{ curr - dirX };
+	const Point2D&			cellR		{ curr + dirX };
+
+	const char				charU		{ fMap[ cellU.fY ][ cellU.fX ] };
+	const char				charD		{ fMap[ cellD.fY ][ cellD.fX ] };
+	const char				charL		{ fMap[ cellL.fY ][ cellL.fX ] };
+	const char				charR		{ fMap[ cellR.fY ][ cellR.fX ] };
+
+	States	possibleMoves;
+
+	if ( current.fDir == Direction::U )
+	{
+		if ( canMoveTo( charU ) )
+			possibleMoves.emplace_back( cellU, Direction::U, 1 );
+
+		if ( canMoveTo( charL ) )
+			possibleMoves.emplace_back( cellL, Direction::L, 1001 );
+
+		if ( canMoveTo( charR ) )
+			possibleMoves.emplace_back( cellR, Direction::R, 1001 );
+	}
+
+	if ( current.fDir == Direction::D )
+	{
+		if ( canMoveTo( charD ) )
+			possibleMoves.emplace_back( cellD, Direction::D, 1 );
+
+		if ( canMoveTo( charR ) )
+			possibleMoves.emplace_back( cellR, Direction::R, 1001 );
+
+		if ( canMoveTo( charL ) )
+			possibleMoves.emplace_back( cellL, Direction::L, 1001 );
+	}
+
+	if ( current.fDir == Direction::L )
+	{
+		if ( canMoveTo( charL ) )
+			possibleMoves.emplace_back( cellL, Direction::L, 1 );
+
+		if ( canMoveTo( charD ) )
+			possibleMoves.emplace_back( cellD, Direction::D, 1001 );
+
+		if ( canMoveTo( charU ) )
+			possibleMoves.emplace_back( cellU, Direction::U, 1001 );
+	}
+
+	if ( current.fDir == Direction::R )
+	{
+		if ( canMoveTo( charR ) )
+			possibleMoves.emplace_back( cellR, Direction::R, 1 );
+
+		if ( canMoveTo( charU ) )
+			possibleMoves.emplace_back( cellU, Direction::U, 1001 );
+
+		if ( canMoveTo( charD ) )
+			possibleMoves.emplace_back( cellD, Direction::D, 1001 );
+	}
+
+	return possibleMoves;
+}
+
+int Maze::heuristic(const Point2D& a, const Point2D& b, std::byte dir)
+{
+	using namespace Direction;
+
+	const int	deltaX				{ std::abs( a.fX - b.fX ) };
+	const int	deltaY				{ std::abs( a.fY - b.fY ) };
+	const int	manhattanDistance	{ deltaX + deltaY };
+	const int	turn				{ deltaX != 0 && deltaY != 0 };
+
+	return manhattanDistance + turn * 1000;
+}